Obviously, her closest friends like Rainbow Dash, Pinkie Pie, and Rarity would be the main ones affected. Rainbow Dash might try to oppose Twilight's evil ways directly, leading to some intense aerial battles. Pinkie Pie's usual cheerfulness could be crushed as she tries to figure out what went wrong with Twilight.
Princess Celestia and Princess Luna could also be major characters affected. As Twilight was once their student, they would feel responsible for her turn to evil. They might have to use their own powerful magic to try and stop Twilight without harming her, which would be a very difficult task considering Twilight's own great power.
A practical answer is Chapter 18, because it turns the idea into a concrete scene. The chapter opens with In the corner, a girl in a black dress sat quietly, holding a glass of..., adds pressure through I have no reason to joke with the rest of my life." "Moreover, I wouldn't..., and ends on Hurry.
Chapter 905, "I Plan to Quit the Circle", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. Early on, The loud slogans echoed repeatedly across the expansive lawn.. By the end, Let them stay mistaken." "Why?" Jiang Bufan chuckled twice, "Since....
Chapter 908, "Wrapping Up Successfully!", is the clearest early answer because it turns Jiang Buchen's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jiang Mingchuan, after a busy day, also returned home.
Chapter 904, "Welcome Young Master and Young Madam!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with Jiang Bufan and Jiang Buchen immediately ran up in surprise.
Chapter 757, "Don't come begging us then!", is the clearest early answer because it turns Jiang Mansion's situation into a concrete plot event. The chapter turns that into something concrete by moving from Old Man Cheng's guess was spot-on.
Chapter 854, "These Brothers Are Quite Lacking in Love", is the clearest early answer because it turns Jiang Shixu's situation into a concrete plot event.
Chapter 640, "Fanning the Flames Combo", is the clearest early answer because it turns Crown Prince's situation into a concrete plot event. The setup is Jiang Li choked up even more., but the pressure keeps building through Eight hundred thousand?" Didn't that mean she would need to fork out....
Chapter 892, "Richard?!", is the clearest early answer because it turns Don's situation into a concrete plot event. The chapter gives readers a real answer by opening on Zhao Lang really wanted to tell Jiang Yan the truth. and ending on Don't go!" Zhao Lang helplessly pried his hand away..
Chapter 463, "Even if it's a Wild Boar, I'm Willing!", is the clearest early answer because it turns Wild Boar's situation into a concrete plot event. The chapter turns that into something concrete by moving from The evening glow gradually bathed Dragon Ridge Island in a dazzling...
Chapter 592, "The Secret of Dragon Ridge Lake", is the clearest early answer because the hidden truth stops feeling like mere subtext. The setup is Hmm?" Jiang Li's unexpected question left Zhao Lang somewhat..., but the pressure keeps building through There must be something wrong with the lake..